KK early in APPT Step 4

[Marc M]

First post in HSMTT. If this needs to be moved to STT that's fine, but it's really the stakes that has me questioning this hand. Also, sorry for no converter, but the one I usually use is gone, and I saw a few threads in here without one, so I thought maybe it was ok.

PokerStars Game #13270648901: Tournament #67323802, $200+$15 Hold'em No Limit - Level I (10/20) - 2007/11/16 - 03:32:29 (ET)
Table '67323802 1' 9-max Seat #8 is the button
Seat 1: sharkbait333 (1420 in chips)
Seat 2: frogy2 (1470 in chips)
Seat 3: UsersRLosers (1650 in chips)
Seat 4: MNTJ2198 (1470 in chips)
Seat 5: 4played (1510 in chips)
Seat 6: marcmpr (1540 in chips)
Seat 7: hibirdharry (1550 in chips)
Seat 8: GypsieChris (1470 in chips)
Seat 9: bigpaddy (1420 in chips)
bigpaddy: posts small blind 10
sharkbait333: posts big blind 20
*** HOLE CARDS ***
Dealt to marcmpr [Ks Kd]
frogy2: folds
UsersRLosers: folds
MNTJ2198: folds
4played: folds
marcmpr: raises 40 to 60
hibirdharry: folds
GypsieChris: folds
bigpaddy: folds
sharkbait333: calls 40
*** FLOP *** [2c 6d 8h]
sharkbait333: checks
marcmpr: bets 60
sharkbait333: calls 60
*** TURN *** [2c 6d 8h] [6c]
sharkbait333: checks
marcmpr: bets 120
sharkbait333: raises 260 to 380
marcmpr: calls 260
*** RIVER *** [2c 6d 8h 6c] [5c]
sharkbait333: bets 680
Hero?

I mostly play live, & micro-limits online, but I tried the steps thing for fun & here I am at $215. I would never throw this away live unless I really knew the guy I was up against, and I'd pretty much never fold it online at the limits I play normally ($1-$6). But from all my reading of 2+2, this seems like a fold at higher stakes, no?